"Noble Gases - Properties of Element Groups." Chemistry - Periodic Table, Chemistry Projects, and Chemistry Homework Help. Web. 25 Oct. 2009. <http://chemistry.about.com/od/elementgroups/a/noblegases.htm>.


"Visual Elements: Group 18 - The Noble Gases." Royal Society of Chemistry, the largest organization in Europe for advancing the chemical sciences. Web. 25 Oct. 2009. <http://www.rsc.org/chemsoc/visualelements/Pages/data/intro_groupviii_data.html>.


Thomas, Jens. Noble Gases (Elements). New York: Benchmark Books (NY), 2002. Print.


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